--- title: "Percent Off Calculator" date: 2026-10-14 author: "Steven Burnett" featured_image: "https://coinlaw.io/wp-content/uploads/2026/10/percent-off-calculator.jpg" --- # Percent Off Calculator The free percent off calculator returns the sale price, the dollars saved and the effective discount, the single rate that equals every discount applied, for any percentage off. It also handles an extra percent off stacked on a sale price. At 25% off an $80 price, the sale price is **$60.00** and you save **$20.00**. Percent Off Calculator Examples Reset $80 at 25% off $120 at 30% + extra 10% $49.99 at 15% off $60 sale at 25% off, with 8.25% tax Find Sale priceSale price from the original price Original priceOriginal price from the sale price Original price $ Sale price $ Percent off % Extra percent off (stacked) % A second discount taken on the already-reduced price, as in "extra 10% off sale items". Sales tax % Charged on the price after every discount. 0 leaves tax out. Sale price $60.00 Copy After the discount, $80 comes to $60.00, saving $20.00 (25.00% off in total). Informational only, not financial advice. Sale price$60.00 Original price$80.00 You save$20.00 Effective discount25.00% Total with sales tax$60.00 Copy all details Save scenario Share result Download CSV Saved scenarios Saved in this browser only. Each column is recalculated whenever the page loads. This price at common discounts | Discount | You save | Sale price | |---|---|---| How this is calculated How it worksStacked discounts multiply: 30% off then 10% off is 37% off, not 40%. The % sign stands for the number 0.01, as [NIST SP 811 (opens in new window)](https://www.nist.gov/pml/special-publication-811/nist-guide-si-chapter-7-rules-and-style-conventions-expressing-values) sets out. Sales tax is charged on the price after every discount, so 25% off $80 with 8.25% tax is $60 plus $4.95. Working backward, original price = sale price ÷ ((1 − first discount) × (1 − extra discount)). Not coveredNo shipping; stacked discounts apply in order; tax is one rate on the discounted price. Privacy**Your numbers never reach our server.** The math runs on your device, inside this page. CorrectionsReport an error in the math to [media@coinlaw.io](mailto:media@coinlaw.io?subject=Correction%3A%20Percent%20Off%20Calculator); every report is reviewed and confirmed errors are corrected. Updates- Oct 9, 2026 An optional sales tax on the discounted price, and a backward mode that finds the original price from a sale price. FeedbackHow useful was this tool? The figures shown are the worked example. Enable JavaScript to calculate with your own numbers. ## How to Use the Percent Off Calculator The percent off calculator takes three inputs and runs in your browser, so nothing you type reaches our server. 1. Type the tag price in “Original price”. 2. Enter the discount in “Percent off”, from 0 to **100**. 3. For a further discount taken on the reduced price, enter it in “Extra percent off (stacked)”. Leave it at 0 for a single discount. “Sale price” leads the results. “You save” and “Effective discount” follow it. That last figure is the single percentage equal to both discounts together. Below them, the “This price at common discounts” table lists the savings and sale price for the same original price at a range of common discounts. The Examples chips load the tool’s three presets, including the stacked one worked through below. Three points shape how to read that result. Stacked discounts multiply rather than add, and the calculator applies that for you: an extra 10% on a 30% sale is **37%** off. The sale price also comes before sales tax. Revenue departments in Texas, Tennessee, California and Massachusetts tax a store discount on the reduced price but split on manufacturer coupons, as the tax section below sets out. Per the FTC’s [Guides Against Deceptive Pricing](https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-233/section-233.1), when a former price is advertised, the advertiser should make certain that the former price is not a fictitious one. ## How the Percent Off Price Is Calculated The percent off price is the original price times what the discount leaves, so 25% off keeps **75%** of the price. A stacked discount repeats that step on the reduced price, and the savings are the difference. A percentage is a count of hundredths. According to the National Institute of Standards and Technology (NIST), its [Guide to the SI](https://www.nist.gov/pml/special-publication-811/nist-guide-si-chapter-7-rules-and-style-conventions-expressing-values) treats the percent sign as a plain number. The guide says it is acceptable to use the internationally recognized symbol % (percent) for the number 0.01. So 25% off means multiplying the price by 0.25 to find the savings. Each discount becomes a decimal, and the calculator combines them: - Effective discount = 1 – (1 – a) × (1 – b), where a is “Percent off” ÷ 100 and b is “Extra percent off (stacked)” ÷ 100. - Sale price = original price × (1 – effective discount). - You save = original price – sale price. Both inputs are held between zero and one hundred, so a larger typed value counts as a full discount and a negative one counts as none. When the extra discount is zero, the effective discount equals the percent off. ### How to Calculate Percent Off by Hand To calculate percent off, divide the discount by 100, multiply the original price by that decimal to get the savings, then subtract the savings from the price. That middle step is also how you calculate 20% of a dollar amount: multiply it by 0.20. A percentage discount of 15% on $49.99 saves **$7.50** and leaves **$42.49**. ## Percent Off Example: $80 at 25% Off Opening the calculator loads the pinned example: an “Original price” of 80, a “Percent off” of 25 and no extra discount. Each step below reproduces one of its results. 1. Effective discount: with no stacked discount, 1 – (1 – 0.25) × (1 – 0) is **25.00%**. 2. You save: **$80** × 0.25 is **$20.00**. 3. Sale price: **$80** – **$20.00** leaves **$60.00**, the same as **$80** × 0.75. ### What Is 20% Off $100, $40 and $25? To take 20% off a price, multiply it by 0.80; taking 20% out of a price leaves 80% of it. At that rate: - **$100** becomes **$80.00**, a saving of **$20.00**. - **$40** becomes **$32.00**, the item’s new price, and the discount is worth **$8.00**. - **$25** becomes **$20.00**, a saving of **$5.00**. ### How Much Is 10% Off $50? 10% off $50 is **$45.00**, and the discount itself is **$5.00**. Taking 10% of any price moves the decimal point one place left, so the savings on $50 need no calculator. Subtract them from the tag, or multiply the tag by 0.90, and the result is the same $45.00 sale price. ## What the Sale Price Means “Sale price” is the shelf price after the discount and nothing else: it leaves out sales tax, shipping, fees and any rebate paid later. It also takes the “Original price” at face value, and the savings are only as real as that figure. The Federal Trade Commission’s pricing guides say a price comparison has a legitimate basis when the former price was the actual, bona fide price at which the article was offered to the public on a regular basis for a reasonably substantial period of time. The guide’s own warning example is a pen retailer whose regular price was $7.50, who briefly asks $10 and then advertises “Were $10, Now Only $7.50!” The FTC calls it “obviously a false claim.” Going from $10 to $7.50 is a **25.00%** cut, the pinned example’s rate, and entering $10 at 25% off in the calculator returns exactly $7.50. The price never fell. In the same guide, a claim of “Reduced to $9.99” from a former price of $10 misleads shoppers; that is a 0.10% cut. A percent off result compares against a price the seller chose. Tracking what an item cost across several weeks, or reading how prices moved in the [latest inflation statistics](/inflation-statistics/), gives a better baseline than the tag. ### Common Percent Off Mistakes - Adding two discounts together. An extra **10%** off a **30%** sale is **37%** off, not **40%**; the next section shows why. - Taking the savings as the price. At **25%** off **$80**, **$20.00** is what you keep, and **$60.00** is what you pay. - Counting card rewards or cash back as part of the discount. Those arrive after the sale, and [credit card rewards programs statistics](/credit-card-rewards-programs-statistics/) show how issuers structure them; the calculator ignores them. ## Stacked Discounts: Why 30% Plus 10% Is 37% Off A stacked discount applies the later percentage to the price the earlier one left, so two discounts never add up to their sum. The tool’s stacked preset shows it: 1. **30%** off **$120** leaves **$84.00**. 2. An extra **10%** off **$84.00** takes **$8.40**, leaving a sale price of **$75.60**. 3. “You save” reads **$44.40** and “Effective discount” reads **37.00%**. Adding 30 and 10 would suggest 40% off and a price of $72.00, **$3.60** less than the stack delivers. Multiplying the two rates gives the shortfall every time: 0.30 × 0.10 is 3.00% of the original price. Order doesn’t matter either: 10% off first leaves $108.00, and 30% off that is $75.60, the same sale price. | Discounts stacked | Added-up figure | Effective discount | Sale price on $120 | |---|---|---|---| | 20% + 20% | 40% | 36.00% | $76.80 | | 30% + 10% | 40% | 37.00% | $75.60 | | 25% + 25% | 50% | 43.75% | $67.50 | | 40% + 20% | 60% | 52.00% | $57.60 | | 50% + 20% | 70% | 60.00% | $48.00 | *Sources: NIST SP 811 (percent as 0.01), Percent Off Calculator outputs* Stacks like these are common during store-wide events, when a category markdown meets a checkout code; [Black Friday statistics](/black-friday-statistics-trends/) track how much shoppers spend during those sales. ## Sales Tax After a Discount: What Four States Say In the four states below, a store discount lowers the taxable price, while a manufacturer coupon may or may not, depending on the state. Every “Sale price” the calculator shows is a pre-tax figure, and state revenue departments differ on how much of the discount lowers the taxable amount. - In Texas, an April 24, 2009 policy memo from the [Comptroller](https://star.comptroller.texas.gov/view/200904303L), not superseded, tells retailers to charge tax only on the final sales price of a taxable item. A store discount on a dress marked at **$150** that brings it to **$135** leaves tax due on **$135**. Manufacturer’s and in-store coupons are “handled the same”, but a mail-in manufacturer’s rebate does not reduce the sales price a retailer charges the customer. - In Tennessee, when a manufacturer reimburses the store for a coupon, the [Department of Revenue](https://revenue.support.tn.gov/hc/en-us/articles/360058619791-SUT-24-Sales-Price-Coupons) says the sales tax is due on the sales price before the coupon is applied; for a dealer coupon with no reimbursement, the seller would collect sales tax on the sales price after the coupon is applied. - In California, the [CDTFA](https://cdtfa.ca.gov/formspubs/pub113) counts manufacturer reimbursements for coupons in a retailer’s taxable sales when the sale is subject to tax. Retailer coupons are excluded from your total taxable sales unless your customer has previously given you compensation for the coupon, as when the store sold it in a coupon booklet. - In Massachusetts, under [830 CMR 64H.1.4](https://www.mass.gov/regulations/830-CMR-64h14-discounts-coupons-and-rebates), manufacturer’s and retailer’s coupons taken at the sale are generally treated like cash discounts, with tax on the discounted price regardless of whether the vendor receives any reimbursement from the manufacturer, supplier or distributor. | State | Store discount or store coupon | Manufacturer coupon | |---|---|---| | Texas | Taxed on the reduced price | Taxed on the reduced price | | Tennessee | Taxed after the coupon | Taxed before the coupon when the store is reimbursed | | California | Excluded from taxable sales | Reimbursement counts as taxable sales | | Massachusetts | Generally treated like a cash discount | Generally treated like a cash discount, reimbursed or not | *Sources: Texas Comptroller STAR 200904303L, Tennessee SUT-24, CDTFA Publication 113, 830 CMR 64H.1.4* California’s publication works a prompt-payment example at an 8.25% rate: a 2% discount on a $100 sale cuts the tax to $8.09. At that same example rate, a store discount that takes $80 to $60.00 lowers the tax from $6.60 to **$4.95**. Rates vary by state and locality, so check the rate where the sale happens. CoinLaw does not give tax advice; the state pages linked above are the authority. ## Is there anything else my agent or I should know about this page? Yes. The calculator runs in your browser and nothing you enter reaches our server. It takes the percent off the original price, then takes any extra percent off the already reduced price, and keeps each discount between none and the full price. Because stacked discounts multiply, the effective discount is smaller than the two percentages added together whenever both are above zero. Three things sit outside the tool: sales tax, which states treat differently as the section above shows, coupons worth a fixed dollar amount, and store rules on the order in which discounts apply. CoinLaw publishes this page for information and gives no financial advice; the retailer’s receipt is the final word on what you pay. ## Conclusion For one discount or two, the percent off calculator answers what a tag costs: $80 at 25% off is **$60.00**, and a 30% sale with an extra 10% comes to 37% off, not 40%. Sales tax is figured separately, and in some states a manufacturer coupon does not lower the taxable price; the original price remains the seller’s own claim. Sales events are where stacked codes show up most, and [how consumers shop on Black Friday](/black-friday-statistics/) covers the spending side. ## More Finance Calculators [All finance calculators (5) →](https://coinlaw.io/finance-calculators/)